How to make an ImageView with rounded corners?

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天涯浪人
天涯浪人 2020-11-21 05:39

In Android, an ImageView is a rectangle by default. How can I make it a rounded rectangle (clip off all 4 corners of my Bitmap to be rounded rectangles) in the ImageView?

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  •  南方客
    南方客 (楼主)
    2020-11-21 06:18

    This is pretty late in response, but for anyone else that is looking for this, you can do the following code to manually round the corners of your images.

    http://www.ruibm.com/?p=184

    This isn't my code, but I've used it and it's works wonderfully. I used it as a helper within an ImageHelper class and extended it just a bit to pass in the amount of feathering I need for a given image.

    Final code looks like this:

    package com.company.app.utils;
    
    import android.graphics.Bitmap;
    import android.graphics.Canvas;
    import android.graphics.Paint;
    import android.graphics.PorterDuffXfermode;
    import android.graphics.Rect;
    import android.graphics.RectF;
    import android.graphics.Bitmap.Config;
    import android.graphics.PorterDuff.Mode;
    
    public class ImageHelper {
        public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
            Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
                    .getHeight(), Config.ARGB_8888);
            Canvas canvas = new Canvas(output);
    
            final int color = 0xff424242;
            final Paint paint = new Paint();
            final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
            final RectF rectF = new RectF(rect);
            final float roundPx = pixels;
    
            paint.setAntiAlias(true);
            canvas.drawARGB(0, 0, 0, 0);
            paint.setColor(color);
            canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
    
            paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
            canvas.drawBitmap(bitmap, rect, rect, paint);
    
            return output;
        }
    }
    

    Hope this helps someone!

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